I've just applied this patch to the track folder named "silver" (Noonan's conversion) and it worked perfectly. Although the sun is shining in this room at the moment, I can see it is a huge graphics quality improvement. The folder has grown from 5.5MB to 26.1MB but, contrary to what I expected the FPS hit was not too bad.
Great job Stefano! Thanks a lot!
Looking forward to what will follow in your project.